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I have a Mac running Lion and I'm wondering if upgrading to Mountain Lion on this mac will slow it down. It's a 4.05 GB download / install, and will installing this OS make my computer slower since it already has Lion? I got this Mac in October 2011, so it's still fairly new. My computer isn't slow, it runs all my games & loads web pages super fast. I just don't want to download Mountain Lion for all the awesome features & pay $20 to realize that it's slowed my $1,800 computer down. I like Lion, but I want Mountain Lion because of iMessage & the AirPlay feature, because I'm getting an Apple TV for me and my boyfriend to use on our new TV we got on Craigslist (LOL).